岩溶地区嵌岩桩基的溶洞处治

广州市茅山互通立交桥的桩基采用嵌岩桩基础，各桩所在处溶洞发育、形状复杂，简要介绍了桩基施工中对溶洞的处治措施。     

基于对偶四元数法的AUV运动仿真

本文应用对偶四元数法(Dual Quaternions)建立AUV六自由度运动学和动力学方程,然后运用数值积分对所建模型进行仿真.对偶四元数是对偶数与四元数在多维空间中的有机结合,它继承了四元数与对偶数的优点,可以在三维空间中统一表示刚体的旋转与平移,并且没有常规欧拉法存在的姿态奇异性问题.仿真结果表明,对偶四元数法表达形式简单而统一,特别适用于具有大姿态角度运动的AUV运动仿真.     

我国高校自主权变迁的逻辑

“高校自主权”是一个中国化的概念,是我国在学习西方大学理念和制度的过程中逐渐形成的价值和权力诉求。建国以来,我国高校自主权经历了从无到有,从政策认可到法律规定的演进历程,但从落实的角度看,高校自主权的变迁始终没有跳出“一收就死、一放就乱”的循环,中央集权制仍然是我国高校自主权变迁路径的内在特征。我国高校自主权变迁路径依赖的逻辑在于,建国初期特定形势下高校管理模式的尝试,在文化、制度和行动者等不同层面“自增强机制”的作用下不断强化并最终陷入“锁定”。而宏观背景的变化、路径的无效率状态以及行动者在制度薄弱环节的积极行动则为破除既定路径依赖提供了“历史否决点”。     

一种基于CFD的水动力系数计算新方法(英文)

Applications of computational fluid dynamic (CFD) to the maritime industry continue to grow with the increasing development of computers. Numerical approaches have evolved to a level of accuracy which allows them to be applied for hydrodynamic computations in industry areas. Hydrodynamic tests, especially planar-motion-mechanism (PMM) tests are simulated by CFD software -FLUENT, and all of the corresponding hydrodynamic coefficients are obtained, which satisfy the need of establishing the simulation system to evaluate maneuverability of vehicles during the autonomous underwater vehicle scheme design stage. The established simulation system performed well in tests.     

水下潜器改进S面控制及控制系统仿真(英文)

S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV). However, it is difficult to adjust their control parameters manually. Choosing the optimum parameters for the controller of a particular AUV is a significant challenge. To automate the process, a modified particle swarm optimization (MPSO) algorithm was proposed. It was based on immune theory, and used a nonlinear regression strategy for inertia weight to optimize AUV control parameters. A semi-physical simulation system for the AUV was developed as a platform to verify the proposed control method, and its structure was considered. The simulation results indicated that the semi-physical simulation platform was helpful, the optimization algorithm has good local and global searching abilities, and the method can be reliably used for an AUV.     

对几组词的辨析

准确地辨析词义，对于我们在写文章时把握词义的着重点、轻重程度、适用对象、风格色彩尤其是在句子中的功能，具有重要作用。一组有一定关系的词，其相同或相异之点，往往不很客易准确地划分开来，这样的词在句于和文章中就不能准确地表达作者的意思甚至产生歧义。     

三种群Lotka—Voherra模型的持久性

研究非自治非周期的Lotka—Voherra系统{x1=x1[b1(t)-a11(t)x1-a12(t)x2-a13(t)x3] x2=x2[-b2(t) a21(t)x1-a22(t)x2] x=x3[-b3(t) a31(t)x1-a33(t)x3]得到该系统具有持久性和正解具有吸引性。     

高维非自治系统周期解的存在唯一性

通过建立并利用齐次线性方程解的估计公式，得到关于非自治周期系统周期解的存在性，唯一性定理，并给出了一个平稳振荡定理，最后给出了定理应用的实例。     

论涉外合同法律适用中的意思自治原则

意思自治原则作为涉外合同当事人选择合同适用法律的首要原则,从15世纪理论萌芽至今,已经历经数百年。它存在和发展不但有其理论价值,更有国际私法上的实践意义。本文将对意思自治原则在当事人选择法律的方式、时间、所选择法律的适用范围以及该原则下当事人权利的限制等问题进行探讨。